AcidTactical Heavy Duty BullDog2 Bipod - Picatinny or Sling Stud Mountable - Extendable to 9" 6" - 9" Extendable Legs Matte Black Aluminum & Steel construction Picatinny Weaver or Sling Stud Mountable (Includes adapter) 6-9.5" Center height Spring Loaded collapsible legs.